How long does it take for emergency contraception to be effective?

Patient's question:

What should I do if I get pregnant unexpectedly? The harm is relatively small. How long does it take for emergency contraception pills to be effective?

Doctor's answer:

Hello, there are many methods of contraception that can be chosen, such as drug contraception, condom contraception, or intrauterine device contraception. Among these, condom contraception is relatively better, as drug contraception can easily cause menstrual disorders.
Hello, if there is no bleeding after taking emergency contraception pills, it generally indicates successful contraception. The withdrawal bleeding usually occurs within 1 week after stopping the medication. Vaginal bleeding may appear, but in some cases, it can take longer. If the period of amenorrhea is prolonged, the amount of withdrawal bleeding may be greater.

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